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Section 2 Safety, Tools and Equipment, Shop Practices

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Unit Objectives Describe hand ... and other system components Can be used on four different stem sizes Crimping tool Cuts Wire ... Power indicator Cap ... – PowerPoint PPT presentation

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Title: Section 2 Safety, Tools and Equipment, Shop Practices


1

Section 2 Safety, Tools and Equipment, Shop
Practices Unit 5Tools and Equipment
2
Unit Objectives
  • Describe hand tools used by the air conditioning,
    heating, and refrigeration technician.
  • Describe equipment used to install air
    conditioning, heating, and refrigeration systems.

3
General Hand Tools (1 of 6)
  • Screwdrivers
  • Straight-slot screwdrivers turn screws with
    straight slots.
  • Phillips head screwdrivers turn screws with
    slots resembling a cross.

4
General Hand Tools (2 of 6)
  • Wrenches
  • Common types of wrenches include the open end
    wrench, the box wrench, and the combination
    wrench.


5
General Hand Tools (3 of 6)
Other wrenches include pipe wrenches and
adjustable wrenches.

6
General Hand Tools (4 of 6)
  • Hex keys
  • Used to turn screws and set screws that have
    female hex heads
  • Also referred to as Allen wrenches

7
Pliers
General Hand Tools (5 of 6)
  • Types of pliers include

Needlenose
Pump pliers
Locking pliers
Slip joint pliers
Linesman
8
General Hand Tools (6 of 6)
  • Hammers
  • Commonly used hammers include

Always be careful when using hammers!

9
Specialized Hand Tools
  • Stock and dies
  • The die is used to cut threads on the external
    surface of piping material.
  • The die fits and locks into the stock during the
    threading process.
  • The stock is used to facilitate the threading
    process.


10
Electric Drills
  • Can be corded or battery operated
  • Some drills variable speed
  • Some types reversible
  • Always disconnect power cord (corded drills) when
    changing the drill bit.

11
Specialized Tools (1 of 4)
  • Nut drivers
  • Used to drive hex head screws
  • Have a socket head
  • Come in a variety of styles

12
Specialized Tools (2 of 4)
  • Refrigeration service wrench
  • Ratcheting wrench used to turn square stems on
    fuel tanks, service valves, and other system
    components
  • Can be used on four different stem sizes

13
Specialized Tools (3 of 4)
  • Crimping tool
  • Cuts Wire
  • Strips wire
  • Crimps solderless connectors onto wires
  • Cuts small bolts


14
Specialized Tools (4 of 4)
  • Inspection mirror
  • Telescopic mirror used to inspect solder joints
    for leaks


15
Tubing Tools (1 of 4)
  • Tubing cutter
  • Available in different sizes and styles
  • Used to cut copper and aluminum tubing and piping
    materials


16
Tubing Tools (2 of 4)
  • The flaring block and yoke are used to create
    flares in soft drawn tubing.

Before the flare

After the flare
17
Tubing Tools (3 of 4)
  • Swaging tools
  • Used to expand the end of a tube so that two
    sections of the same size tubing can be joined
  • Used in conjunction with a flaring block


18
Tubing Tools (4 of 4)
  • Tubing benders
  • Can be spring type or lever type
  • Used to bend soft copper or aluminum tubing

19
Specialized Service Tools (1 of 5)
  • The gage manifold
  • One of the HVAC/R technicians most important
    pieces of equipment
  • Can read pressures on both the high- and
    low-pressure sides of the system
  • Can read pressures below atmospheric on the
    low-pressure side of the system
  • Can be of the two-valve or four-valve variety

20
LOW SIDE GAUGE
HIGH SIDE GAUGE
HIGH SIDE VALVE
LOW SIDE VALVE
MANIFOLD
LOW SIDE HOSE
HIGH SIDE HOSE
CENTER HOSE
21
Specialized Service Tools (2 of 5)
  • The U-tube manometer
  • Can be the mercury or water variety
  • Can measure low pressures in inches of water
    column or millimeters of mercury
  • The liquid level rises on one side and falls on
    the other.
  • The difference between the two liquid levels is
    the pressure reading.

22
Open to atmosphere
To a natural gas valve, for example
1.75
0
1.75
The pressure reading on this manometer is 3.5
inches of water column.
23
Specialized Service Tools (3 of 5)
  • Electronic vacuum gage
  • Measures the vacuum in a refrigeration system
    during the evacuation process
  • Can measure a vacuum down to 50 microns or 0.050
    mm Hg
  • 1,000 microns 1 mm Hg
  • As a vacuum is pulled on a system the micron
    level will drop.

24
Specialized Service Tools (4 of 5)
  • Electronic vacuum gage

Power indicator
Very poor vacuum
Fair vacuum
Good vacuum
Cap
Hose from vacuum pump
25
Specialized Service Tools (5 of 5)
  • Vacuum pump
  • Designed to remove air and noncondensable gases
    from an air-conditioning or refrigeration system

26
Refrigerant Leak Detectors (1 of 2)
  • Halide leak detector
  • It is used with acetylene, propane, or MAPP gas.
  • When ignited, the flame heats a copper disc.
  • Combustion air is drawn through a tube.
  • The open end of the tube is passed over fitting
    or piping.
  • When a leak is detected, the flame will change
    color (from blue to green).

27
Refrigerant Leak Detectors (2 of 2)
  • When a leak is detected, the flame color changes.

28
Other Refrigerant Leak Detectors
  • Electronic leak detectors
  • Contain refrigerant-sensitive elements
  • Reacts to leaks with rapid beeping
  • Ultraviolet leak detectors
  • UV additive introduced to the system
  • Pipes will glow at the point of the leak
  • Ultrasonic leak detectors
  • Detect the sound of escaping refrigerant

29
The Clamp-on Ammeter (1 of 2)
  • It is used to measure current flow in an electric
    circuit.
  • The jaws of the meter are clamped around one
    conductor of the circuit.
  • The meter can also be used to measure voltage and
    resistance.

30
Volt-ohm-milliammeter (VOM)
  • Often referred to as a multimeter
  • Measures volts, ohms, and amps
  • Can be analog or digital styles
  • Come with a number of features, options, and
    accessories

31
Unit Summary
  • Air conditioning, heating, and refrigeration
    technicians should be familiar with available
    hand tools and equipment.
  • Always use tools and equipment properly.
  • Only use tools for the jobs for which they were
    intended.
  • Improper tool usage can result in personal injury.
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